Fuel injection apparatus



Aug. 26, 1958 c. F. HIGH 2,843,951

' FUEL INJECTION APPARATUS Filed March 2, 1954 :s Sheets-Sheet 1 z I I4 INVENTOR 1958 c. F. HIGH 2,848,951

FUEL INJECTION APPARATUS Filed March 2. 1954 s Sheets-Sheet 2 mm mm, in J om m P mm W 0 R A Am A? I 3. .5 ow U ml T wn W H A A A F. E: i 5%: A A l I I \n\\ N 2 M 2 vw .m m in- I I: vm NM 1 Aug. 26, 1958 c. F. HIGH 2,848,951

FUEL INJECTION APPARATUS Filed March 2, l954 3 Sheets-Sheets INVENTOR CAR L F. H l G H ATTO NEY.

FUEL INJECTION APPARATUS Carl F. High, Detroit, Mich, assignorto American Bosch Arma Corporation, "3 corporation of New York Application March 2, 1954, :Serial No, 413,580

3 Claims. (Cl. 103 -2) This invention relates to 'fuel"'injection apparatus and has particular reference to a new and improved form of such apparatus which is relatively simple and economical in construction.

An object of the invention is to provide a new and improved fuel injection pump which is relativ'ely simple, compact and economical in construction and assembly and eflicient in operation.

Another object is to provide -a"fuel injection pump wherein the pumping member, distributing member and actuating member are formed integral.

Another object is to provide ainew and improved fuel injection pump of the type set forth wherein the pumping and distributing members are so formed as to provide a relatively large diameter for porting or distributing and a smaller diameter for pumping.

Another object is to provide a fuel injection pump of the type set forth wherein the pumping and distributing member is provided with an opening in which is positioned a pumping member and delivery valve thereby allowing the apparatus to be relatively small and compact.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts, as the preferred form has been shown by way of illustration only.

Referring to the drawings:

Fig. 1 is an end view, of a device embodying the invention taken from the distributor end thereof;

Fig. 2 is an end view taken from the drive end thereof;

Fig. 3 is a side view thereof;

Fig. 4 is a sectional view taken on line 5-5 of Fig. l,

' looking in the direction of the arrows;

Fig. 5 is a sectional view taken on line 66 of Fig. 3, looking in the direction of the arrows; and

Fig. 6 is a fragmentary sectional view taken on line 7-7 of Fig. 1, looking in the direction of the arrows.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the device embodying the invention comprises a housing designated generally at 10 and comprising the sections 11, 12 and 13 with the sections 11 and 12 secured together by bolts, or the like 14 and the sections 12 and 13 secured together by the hollow bolts 15 which also serve as outlets for the pump as hereinafter described.

The drive shaft 16 is journaled in the housing section 11 and is adapted to be connected to the usual engine drive means.

Also provided in the housing section 11 is the roller 17 which is mounted on pivot 18. Section 11 of housing 10 is also provided with the lubrication connection 19 for connection to a source of lubricating oil for effecting lubrication of roller 17, shaft 16, and the rotor 20, which posite the face cam portion 22.

2,848,951 Patented Aug. 26, 1958 ment with roller 17 by coilspring which has its opposite end engaging section 12 of the housing.

Rotor 20 is also provided with the internal pumping and distributing-portion or bore 26 adjacent its end op- In the bore 26 is-provided the stationary annular plunger member 27 having a bore 28 in which is positioned the delivery valve 29 which is normally retained in closed position bydeliver'y valve spring 30.

Fuel from a supply tank entprs inlet 31 and passes through annulus 32 to ports 33 from which it passes through plunger port 34 to supply pumping chamber-'35 during the suction stroke of the rotor or plunger. The

"end 36 of rotor 20 functions as supply pumpand when his near the end of its pumping stroke the rotation of rotor or'plunger 20 closes inlet port 34 and puts into registry discharge port 37 in rotor 20 with annular discharge passage 38 in the body from which the fuel passes through port 39 and fuel line 40 through a filter (not shown) to inlet 41 of the injection pump.

On the suction stroke of the injection pump rotor fuel is drawn from inlet 41 through passage 42 and metering valve slot 43 and port 44 to one of the inlets 50 from which it passes into the pumping chamber 45.

On the pumping or discharge stroke of the rotor or pumping plunger, the inner plunger 27 is raised until it engages maximum fuel stop 46 which may be adjusted to vary the maximum fuel quantity. Further movement of the plunger or rotor 20 on its pumping stroke compresses fuel in the chamber between the inner plunger 2'? and the adjacent wall of the bore in the rotor 20.

The fuel at delivery pressure raises the delivery valve 29 and passes through radial port 47a in inner plunger 27 and radial port 47 in rotor or plunger 20 to each of the outlets 48 successively.

The termination of the delivery takes place when the further rotation of the pumping plunger causes the leading edge of the intake port 50 to engage the spill port 51 which terminates the injection by reducing the pressure in the pumping chamber 45 and thereby closing the delivery valve 29.

Each of the intake ports 50 is successively aligned with spill port 51 upon rotation of the rotor and the cycle is repeated once for each of the outlets during rotation of the plunger 20. One of the ports 50 is provided for each outlet of the pump, that is, the number of inlets 50 corresponds with the number of outlets 48.

Metering valve 53 having the metering groove 43 is connected to a pneumatic governor 54 with a manual adjusting lever 55 which holds groove 43 in alignment with port 44.

It will be noted that the rotor 20 embodying the pumping and distributing portion and the face cam or actuating portion which are all integral and provides a large diameter for porting thus allowing adequate spacing of the ports with adequate sealing surface therebetween and also provides a smaller diameter for pumping and with the pumping plungers and delivery valve positioned within the rotor.

The operation of the device is believed to be clearly described above.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. In a fuel injection pump for an internal combustion engine, a housing having a bore and a fuel inlet passage and a plurality of outlet passages communicating with said bore, a pumping and distributing member in said bore, said pumping and distributing member having a bore and fuel inlet and delivery ports communicating therewith, an adjustable throttle valve in said fuel inlet passage for controlling the quantity of fuel supplied to said bore of said pumping and distributing member, and governor means operatively connected to said throttle valve for adjusting the position of said valve, said pumping and distributing member having a spill or bypass passage for controlling the termination of injection.

2. In a fuel injection pump for an internal combustion engine, a housing having a bore and a fuel inlet passage and a plurality of outlet passages communicating With said bore, a pumping and distributing member in said bore, said pumping and distributing member having a bore and fuel inlet and delivery ports communicating therewith, an adjustable throttle valve in said fuel inlet passage for controlling the quantity of fuel supplied to said bore of said pumping and distributing member, and governor means operatively connected to said throttle valve for adjusting the position of said valve, said pumping and distributing member having a spill or bypass passage for controlling the termination of injection, and a delivery check valve in said bore in said pumping and distributing member.

3. In a fuel injection pump for an internal combustion engine, a housing having a bore and a fuel inlet passage and a plurality of outlet passages communicating with said bore, a pumping and distributing member in said bore, said pumping and distributing member having a bore and fuel inlet and delivery ports communicating therewith, an adjustable throttle valve in said fuel inlet passage for controlling the quantity of fuel supplied to said bore of said pumping and distributing member, said pumping and distributing member having a spill or bypass passage for controlling the termination of injection, a stationary plunger in said bore in said pumping and distributing member, said stationary plunger having a bore and a distributing port communicating therewith and a delivery check valve in said bore in said stationary plunger to control the delivery of fuel through said distributing port.

References Cited in the file of this patent UNITED STATES PATENTS 2,254,441 Muller Sept. 2, 1941 2,365,636 Hedges Dec. 19, 1944 2,420,970 Parker et al May 20, 1947 2,481,856 Medhaug Sept. 13, 1949 2,491,795 Bartram Dec. 20, 1949 2,667,840 High Feb. 2, 1954 2,679,804 Bischoff June 1, 1954 

